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I just got a new board and it's giving me error messages

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Especially if you plug your board into mchelper and you're seeing messages like
USB /system/error Unknown Property
you need to update the firmware on your board. 

Though new boards come pre-programmed, from time to time improvements are made to the firmware that we don't have a chance to load on the boards before they get shipped from the factory.   For this reason, it's a good idea to upload the newest version onto your board.  The newest version (called Heavy.bin) can always be found on the Downloads page.  For help on uploading the firmware, refer to the how-to page here.